Fully typed Memoize function, maintains argument function and expected return types

memoize.ts

function memoize<T extends (...args: any[]) => any>(
  func: T
): (...funcArgs: Parameters<T>) => ReturnType<T> {
  const results = {};

  return (...args: Parameters<T>): ReturnType<T> => {
    const cacheKey = JSON.stringify(args);

    if (!results[cacheKey]) {
      results[cacheKey] = func(...args);
    }

    return results[cacheKey];
  };
}